Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/827
1. Start ListenSMTP port 2525 with 1 maximum connection, 10 seconds of
timeout
```
$ telnet 0 2525
Trying 0.0.0.0...
Connected to 0.
Escape character is '^]'.
220 localhost ESMTP Apache NiFi
helo .
250 localhost
mail from: x
250 Ok
rcpt to: x
250 Ok
data
354 End data with <CR><LF>.<CR><LF>
```
wait for longer than timeout
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